Without the credit boom it's completely useless to a level 55 player.
Most people who get these cubes will be 55s since lower level players will not be able to afford them on the GTN.
They need to find some other means of giving a player at max level something back that they can use. To just take the credit boom away as a quick fix without considering what that does and trying to replace it with something else useful to a level 55 player is just lazy.
Now these cubes are literally just paying for minor story content since there's nothing else useful from them.
Standard operating procedure for BW. Zero planning, knee jerk reaction that breaks part of the game and they most likely plan on "fixing" this at a later date which will never come. There is now no reason to by crates, too much broken content in them, that will not be fixed.